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Generally in the itunes store under requirements it tell you that the application is compatible with either iphone, ipod touch or ipad. You should note that the ipod touch is what you seem to call the itouch.

reinstall itunes and ipod software onto the computer. This will reset the settings back to default. youll also have to restore your itouch. I have an itouch as well and thats happened to me before. I restored it and reinstalled everything and it worked.

I had exactly the same problem, you have to sync them on itunes. Plug in your itouch, open itunes and make sure it is the version with an applications section in the libary. Then click on your itouch in Devices go to the end applications tab and you have to sync them. This worked for me.

First you need to restart your itouch.Then, plug it in to your computer and wait for iTunes to pop up. Select a few songs from your library or some movies that you have and drag them to your iPod.What I did was, dragged some movies on my itouch to the tv shows folder as soon as i did this everything popped back on to my screen